Die Messung der Dichte zur Umsatzbestimmung bei Polymerisationsreaktionen II.. Umsatzbestimmung in einem Polymerisationsansatz nach verschiedenen Methoden

Trathnigg, Bernd

doi:10.1002/apmc.1980.050880110

Cited by 5 publications

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Kinetics and reaction mechanism of template polymerization investigated by conductimetric measurements. Part 1. Radical polymerization of sodium acrylate

et al. 1999

View full text Add to dashboard Cite

The radical homopolymerization of sodium acrylate in water in the presence of potassium peroxodisulphate as initiator was investigator through the use of conductimetry and dilatometry. The kinetics were monitored while varying either the monomer concentration or temperature. Initial rate and order of reaction were determined with good accuracy in a comparative way. The conductimetric method proved superior in monitoring the reaction progress at temperatures higher than 50°C, allowing the activation energy of the reaction to be determined. © 1999 Society of Chemical Industry

show abstract

Kinetics and reaction mechanism of template polymerization investigated by conductimetric measurements. Part 1. Radical polymerization of sodium acrylate

et al. 1999

View full text Add to dashboard Cite

show abstract

Size‐Exclusion Chromatography of Polymers

Trathnigg

2000

Encyclopedia of Analytical Chemistry

View full text Add to dashboard Cite

Size‐exclusion chromatography (SEC) is a standard technique for determining molar mass averages and molar mass distributions (MMDs) of polymers. Sometimes the termsgel permeation chromatography (GPC) or gel filtration chromatography (GFC) are also used, but SEC should be preferred, because this term describes the mechanism much better: polymer molecules are separated according to their hydrodynamic volumes (which can be correlated with molar mass), with the larger size molecules exiting first followed by the smaller. Molar masses are determined either from a calibration or using molar mass sensitive detectors. In the case of copolymers, the knowledge of chemical composition along the MMD is required, which can be obtained from combinations of different concentration detectors. As the hydrodynamic volumes of different polymers are typically somewhat different, molecules with different chemical composition and different molar mass will be eluted in the same slice of the chromatogram. Obviously, a discrimination between such molecules requires a two‐dimensional separation, in which one dimension may be SEC, and the other one a chromatographic technique, which separates according to chemical composition rather than molar mass, such as liquid adsorption chromatography (LAC), liquid chromatography at the critical point of adsorption (often also called liquid chromatography under critical conditions, LCCC), supercritical fluid chromatography (SFC), temperature rising elution fractionation (TREF), etc. In the lower molar mass range, mass spectroscopy competes with SEC. The most frequently used technique is matrix‐assisted laser desorption/ionization time‐of‐flight mass spectroscopy (MALDI/TOF/MS), which cannot, however, provide quantitatively accurate MMDs. Due to its excellent resolution in molar mass, it can be combined with chromatographic techniques in order to increase the reliability of the analysis.

show abstract

Die messung der dichte zur umsatzbestimmung bei polymerisationsreaktionen, 3. Erhöhung der genauigkeit durch eine einfache eichmethode

Trathnigg

Schneditz

1982

Makromol. Chem., Rapid Commun.

View full text Add to dashboard Cite

EmleitungWahrend die Volumenmessung (Dilatometrie) zur Umsatzbestimmung bei Polymerisationsreaktionen sehr groRe Verbreitung gefunden hat, ist der Einsatz der Dichtemessung fiir diese Zwecke noch verhdtnismliaig neu; wohl deshalb, weil erst seit etwas mehr als zehn Jahren geeignete MeBgerate zur Verfiigung stehen, nilmlich seit der Entwicklung der Dichtemessung nach der Biegeschwingermethode durch Kratky, Leopold und Stabinger -3). Erste Versuche, dieses Prinzip auf polymerisierende Systeme anzuwenden, stammen von Braun und Disselhoff4), Rentzsch und Schulz", Jaeger, Wandrey, Reinisch und Linow6) sowie Abbey'), der sogar heterogene Systeme untersuchte.

show abstract

Die Messung der Dichte zur Umsatzbestimmung bei Polymerisationsreaktionen II.. Umsatzbestimmung in einem Polymerisationsansatz nach verschiedenen Methoden

Abstract: Ein Dichtemeßsystem nach der Biegeschwingermethode erweist sich als geeignetes Gerät für die schnelle und genaue Bestimmung des Umsatzes bei radikalischen Polymerisationen in verdünnten Lösungen, wie durch Vergleich mit chromatographischen und gravimetrischen Methoden gezeigt wird.

Cited by 5 publications

References 6 publications

Kinetics and reaction mechanism of template polymerization investigated by conductimetric measurements. Part 1. Radical polymerization of sodium acrylate

Kinetics and reaction mechanism of template polymerization investigated by conductimetric measurements. Part 1. Radical polymerization of sodium acrylate

Size‐Exclusion Chromatography of Polymers

Die messung der dichte zur umsatzbestimmung bei polymerisationsreaktionen, 3. Erhöhung der genauigkeit durch eine einfache eichmethode

Contact Info

Product

Resources

About